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Ferroelasticity in an Organic Crystal: A Macroscopic and Molecular Level Study
Sajjad Husain Mir1, Yuichi Takasaki1,2, Emile Richard Engel1
1Department of Materials System Science, Graduate School of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama, Kanagawa, 236-0027, Japan.
Angewandte Chemie (International Ed. in English)
|September 30, 2017
Summary
Researchers discovered ferroelasticity in the organic crystal 5-chloro-2-nitroaniline, a material exhibiting significant crystal bending and a high maximum strain of 115.9%. This finding opens new avenues for organic ferroelastic materials.
Area of Science:
- Materials Science
- Crystallography
- Organic Chemistry
Background:
- Ferroelasticity is well-documented in inorganic solids but understudied in fragile organic crystals.
- Lack of mechanical analysis methods for small crystals hinders organic ferroelasticity research.
Purpose of the Study:
- To present the first example of ferroelasticity in an organic molecular crystal.
- To characterize the ferroelastic behavior of 5-chloro-2-nitroaniline.
Main Methods:
- Macro- and microscopic characterization techniques.
- Cyclic stress-strain curve analysis.
- Single-crystal X-ray structure analysis.
Main Results:
- Ferroelasticity confirmed in 5-chloro-2-nitroaniline organic crystal.
- Observed cyclic stress-strain curve meets ferroelasticity criteria.
- Substantial crystal bending achieved through large molecular orientational shifts at the twinning interface.
Conclusions:
- The organic crystal 5-chloro-2-nitroaniline exhibits ferroelasticity.
- Achieved a record maximum strain of 115.9% in twinning materials.
- Potential application as a mechanical damping agent due to high dissipated energy density.
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